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Comment by Dr. Krishna Kumari Challa 4 hours ago

No evidence mobile phones cause brain cancer—new study
Comprehensive analysis of 63 studies (1994–2022) shows no association between mobile phone use and brain, head, or neck cancers, regardless of duration or intensity of use. Additional reviews report no link between radio/TV transmission and childhood leukemia. Overall evidence for most other health outcomes is limited or low quality, but current exposure limits appear adequate and consistent with stable brain cancer incidence rates.

Comment by Dr. Krishna Kumari Challa 6 hours ago

What people look at most reflects their brains' specialization

While people explore the environment around them, their eyes constantly move between different objects, faces and other specific segments of a visual scene. This dynamic process allows them to prioritize visual information relevant to a task at hand or that they find more interesting, ignoring details or items in their surroundings that they deem less important.

Short pauses on a specific part of a visual scene are known as fixations. Past studies have shown that different people can exhibit distinct fixation patterns. For instance, some people might spend more time looking at faces, while others might pause longer on written words or specific types of objects.

Researchers recently carried out a study aimed at better understanding the relationship between what people tend to gaze at most and how their brains represent visual information. Their findings, published in Nature Human Behaviour, suggest that where people naturally direct their gaze reflects how their individual brains encode different types of visual stimuli.

Individuals reliably differ in how they look at complex visual scenes, with the most prominent variation in their propensity to fixate on faces and text.

To explore the link between people's fixation patterns and how their brains represent visual information, the researchers recruited 61 adults and asked them to complete a basic visual task. This task required them to observe complex natural scenes.

While the study participants looked at these scenes, the researchers tracked their gaze using eye-tracking technology. During a separate experiment, they also used an imaging technique called functional magnetic resonance imaging (fMRI) to collect scans of the participants' brains while they were shown images of faces, words or other visual stimuli.

They found that the propensity to fixate faces or text goes along with enhanced distinctiveness and enlarged functional regions of corresponding categorical representations in the ventral stream. These, in turn, predicted performance on reading and face-recognition tasks.

 found that participants exhibited different fixation patterns, with some spontaneously gazing more at faces and others at words. These distinct fixation patterns were associated with differences in the size and distinctiveness of specific brain regions.

Regions known to play a role in processing faces appeared to be larger and more distinctive in the brains of people who looked more frequently at faces. On the other hand, those who naturally tended to gaze more at text appeared to have larger functional regions specialized in processing written words.

Interestingly, the researchers also found that participants who looked more at faces performed significantly better on face-recognition tasks. In contrast, those who fixated more on text achieved better results on reading tasks.

Thus, active vision appears linked to the precision of category-selective encoding and corresponding neural resources in the individual brain," wrote the authors in their research paper.

Diana Kollenda et al, Active vision is linked to category selectivity in the individual brain, Nature Human Behaviour (2026). DOI: 10.1038/s41562-026-02494-5.

Comment by Dr. Krishna Kumari Challa 6 hours ago

New body index aims to move beyond BMI and works for babies too

Body Mass Index (BMI) has long been used in public health and clinical settings as a simple tool to classify an individual's physical status based on their height and weight. Originally developed in the 1830s by Belgian mathematician Adolphe Quetelet, BMI was designed to describe the characteristics of the average man rather than to assess an individual's health, and it did not account for age, sex, ethnicity or body composition.

For nearly two centuries, BMI has been the go-to measure for healthy body size, but its limitations have sparked a search for a better way to understand the human body. Enter the Consistent Body Mass Index (CBMI), a new approach that questions BMI's underlying assumption that body weight scales with height squared.

Instead, in this new study, researchers used physics and geometry to show that weight is more naturally connected to height cubed (CBMI=(m/h³)1/2), because a human body is a three-dimensional structure. By modeling the body as a cylinder, they developed a formula that links weight, height and waist circumference and better represents the body's proportions.

To see how the model held up in real people, researchers tested it on 400 participants, ranging from newborns to 75-year-olds. CBMI turned out to be a much better way to judge someone's physical health than standard BMI. The numbers backed it up, too: For the entire group, the correlation coefficient (r) was 0.837, a statistical measure of how closely two things move together. The relationship was strongest in children and weaker in adult men.

Serdar Beji et al, Development of a consistent body mass index, Scientific Reports (2026). DOI: 10.1038/s41598-026-61284-1

Comment by Dr. Krishna Kumari Challa yesterday

Roasted and browned: How gut bacteria break down heated foods

Crusty bread, fried meat and roasted coffee owe their characteristic taste and browning to chemical reactions that occur when foods are heated. In the so-called Maillard reaction, amino acids—the building blocks of proteins—react with sugars to produce modified forms of natural dietary compounds.

Heating foods generates modified amino acids such as Nε-carboxymethyllysine (CML) that reach the colon and interact with gut microbiota. In Escherichia coli, the enzyme SpeC degrades CML and other modified amino acids, indicating broad degradative capacity across the gut microbiome. This metabolism produces biogenic amines and is associated with diet-related diseases, suggesting mechanistic links between processed foods, microbial metabolism, and host health.

Researchers have now investigated how such dietary compounds are formed, obtaining new insights into the interplay of diet and gut microbiome.
Their focus was on a modified form of the natural amino acid lysine called Nε-carboxymethyllysine, or CML for short, which often occurs in heated foods. In contrast to natural amino acids, their modified forms are absorbed incompletely or not at all in the small intestine. As such, they pass to the large intestine, where they encounter the gut microbiota—the community of microorganisms that plays an important role in digestion, the immune system and health.

The research team demonstrated in the gut bacterium Escherichia coli that the enzyme SpeC is able to break down CML in addition to its previously known function. The bacteria do not need to develop entirely new tools for this task. Instead, they repurpose their existing repertoire in a creative way. It is particularly notable that SpeC does not recognize CML alone but, like a Swiss pocket knife, can also process other chemically modified amino acids.
Such side activities can give bacteria an initial route to access new dietary compounds. If such a compound becomes regularly available, adaptation can turn the Swiss pocket knife' SpeC into a more efficient tool specialized for this task.
Computational analyses suggest that such degradative capacities are widespread in the human gut microbiome. The study also identifies links to several diseases associated with diet and lifestyle, including bowel cancer, fatty liver disease and hepatitis. It is conceivable, for example, that the bacterial breakdown of CML creates advantages for certain bacteria in an inflamed gut environment. In addition, novel biogenic amines are produced during the breakdown of the chemically modified amino acids—a molecular group that is the subject of intense debate as mediators of bacteria-host communication.

These links do not yet prove a cause-and-effect relationship. But they do suggest that processed food, microbial metabolic pathways and health status may be more closely connected than previously assumed.

Erica F. Aveta et al, Deciphering underground decarboxylase activity towards Nε-modified lysine derivatives in enterobacteria, Food Chemistry (2026). DOI: 10.1016/j.foodchem.2026.150234

Comment by Dr. Krishna Kumari Challa yesterday

Sleep disorders don't just exhaust you, they change your brain

Sleep disorders may do more than leave people feeling tired. New research from Florida International University shows that sleep disorders are associated with structural changes in brain regions involved in attention, motivation and decision-making.

Sleep disorders are associated with structural brain alterations, including thalamic (pulvinar) reductions linked to impaired attention and cognitive control across dyssomnias and parasomnias. Parasomnias additionally show changes in the posterior cingulate cortex, related to motivation, decision-making, and emotion regulation, indicating partly shared and partly distinct neural substrates.

Researchers identified decreases in the thalamus, a brain region critical for filtering information, maintaining focus and supporting higher-level thinking. They specifically found structural changes in the pulvinar, part of the thalamus that helps direct attention and regulate cognitive control.
These changes were also linked to broader brain networks involved in focus and task performance, helping explain why disrupted sleep can contribute to slower responses, impaired decision-making and an increased risk of mistakes and accidents.
The study also uncovered patterns unique to parasomnias. Researchers found structural changes in the posterior cingulate cortex, a region involved in motivation, decision-making and emotional regulation. These findings may help explain why people with parasomnias sometimes experience changes in mood, behavior and emotional control.

Researchers did not find consistent structural changes unique to dyssomnias, suggesting different sleep disorders may affect the brain in distinct ways depending on how sleep is disrupted.

Katharine E. Crooks et al, Sleep disorders and structural alterations in brain regions linked with motivation: a neuroimaging meta-analysis, Scientific Reports (2026). DOI: 10.1038/s41598-026-40818-7

Comment by Dr. Krishna Kumari Challa yesterday

Facial movement analysis detects deepfake videos with more than 95% accuracy

A self-supervised deepfake detection method analyzes discrepancies between audio-predicted and observed facial movements using a 53-parameter FLAME expression model. Pre-trained on >450 hours of video and personalized with ~60 s of target footage, it attains >95% accuracy on standard benchmarks and Sora 2 videos, outperforming supervised, artifact-based detectors.

Kaede Shiohara et al, ExposeAnyone: Personalized Audio-to-Expression Diffusion Models Are Robust Zero-Shot Face Forgery Detectors, arXiv (2026). DOI: 10.48550/arxiv.2601.02359

Comment by Dr. Krishna Kumari Challa yesterday

India's monsoon rain depends on where air gets cleaner
Global aerosol reductions enhance Indian monsoon rainfall more than South Asian cuts alone, with all-India rain increasing 0.28 mm day⁻¹ versus 0.19 mm day⁻¹. Pollution reductions over East Asia can locally increase rain there but decrease it over parts of India via circulation changes, indicating that coordinated international air-quality policy is critical for managing monsoon-dependent water resources.

Ankit Bhandekar et al, South Asian monsoon response to regional aerosol emission reductions: insights from RAMIP, Environmental Research: Climate (2026). DOI: 10.1088/2752-5295/ae7fad

Comment by Dr. Krishna Kumari Challa yesterday

Small dung beetles take a big bite out of farm methane

Dung beetle activity in cattle dung reduced cumulative methane emissions by 85% and overall greenhouse gas emissions by 18% over 90 days. Beetle colonization maintained near-zero methane flux, accelerated early CO2-dominated aerobic decomposition, and induced lasting aeration effects after beetles left, indicating a significant biotic control on manure-derived emissions.

Key findings include:

Methane elimination: While control dung pats exhibited methane spikes on days 6 and 16, pats colonized by dung beetles maintained near-zero methane fluxes throughout the 90-day experiment.
Fast-forwarded decomposition: Beetle activity shifted the decomposition pathway, accelerating the initial release of lower-impact carbon dioxide within the first 14 days compared with dung pats without beetles.
Lasting structural impact: The climate-regulating signature of the beetles persisted long after the insects had physically left the dung pat (most departed by day 23), indicating the physical aeration and tunnelling by beetles induced long-lasting changes to the microbial environment.

Jean Holley et al, Introduced dung beetles suppress methane emissions from cattle dung and alter the temporal dynamics of greenhouse gas flux, Ecological Entomology (2026). DOI: 10.1111/een.70112

Comment by Dr. Krishna Kumari Challa yesterday

Beyond space-use patterns within a commonly used area, a more extreme preemptive behavior is raiding—actively seeking out rivals on their home turf. For example, male chimpanzees silently invade neighboring territories in single file and move toward other groups' vocalizations, apparently preparing to attack rivals. Banded mongooses also engage in lethal gang attacks, conducting raids to kill the offspring of rival groups.

When the threat from outsiders is greater, various mammal species stay closer to one another. For instance, chimpanzees groom and play with one another more in advance of collective territory defense. Such behaviors likely facilitate communication, reduce anxiety, enhance bonding and promote a stronger fighting force.

There is increasing evidence that nonhuman animals adjust various behaviours to enhance information gathering, incentivize contest participation, reduce anxiety, and minimize collective and individual risk in anticipation of encounters with rival groups. These behaviours occur across a diverse range of social species.

Pre-emptive behavior in a landscape of intergroup conflict, Trends in Ecology & Evolution (2026). DOI: 10.1016/j.tree.2026.06.002

Part 2

Comment by Dr. Krishna Kumari Challa yesterday

Animal war preparation: What animals do before going to war

Intergroup conflict is rife throughout the natural world, being found in social species from ants to primates.
Conflict over resources such as territory, space, food or mating exerts a powerful evolutionary force on social species, potentially affecting fitness and survival, say the researchers. Traditionally, research has focused on actions between rival groups during contests and the behavioral consequences afterward. But evolution can also select for preemptive behaviors that maximize the chances of winning in a conflict.

What is becoming very clear is that preemptive behaviour is widespread whenever intergroup conflict is found.
Social animals use a suite of preemptive behaviors in anticipation of conflict, including staying quiet, monitoring their surroundings, conducting raids and bonding through play. In a review published in Trends in Ecology & Evolution , researchers describe how environmental cues and memories of past events can trigger these behaviors. Over generations, these prewar preparations could affect sociocognitive evolution, population dynamics and community structures.

There is growing evidence that the amount of anticipatory behavior displayed is dependent on the current threat level. More is seen when rivals are more likely to be encountered, larger in size, less familiar or more likely to attack.
Humans have long been known to prepare for warfare by increasing surveillance, using elevated areas to gather information, conducting ambushes and raids, and moving quietly through enemy territory to avoid detection. Recent studies of wild animals provide similar examples of preparation for encounters with rival groups.
Observations of chimpanzees have revealed that groups tend to rest on hilltops in areas where intergroup contests occur rather than engage in noisier activities such as feeding or traveling. In addition, experiments have shown that dwarf mongooses respond to olfactory or vocal cues of rivals by moving more slowly and engaging in sentinel behaviors, which allow them to monitor their surroundings more easily.

The threat of intergroup conflict can also influence animals' space-use patterns. To signal territorial ownership, dwarf mongooses deposit more scent marks in response to simulated rival intrusions, and meerkats tend to scent mark near burrows examined by intruders. Similarly, black howler monkeys return to locations of past contests, potentially to advertise their presence to neighbors.

By contrast, Japanese macaques, chacma baboons and long-tailed tits avoid areas inhabited by rivals.
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